Door-operating device for stoves and furnaces



April 8, mm. c. L. GOHMANN DOOR OPERATING DEVICE FOR STOVES AND FURNACESFiled May 23. 1928 3 Sheets-Sheet l rlas L Gohmann ATTORN.

April 8, 1930. c. 1.. GOHMANN DOQR OPERATING DEVICE FOR STOVES ANDFURNACES Filed May 25 1928 3 Sheets-Sheet 2 INVENTOR. Cha 1% L. GohmannA TTORN E Y.

April 8, 1930.

C. L. GOHMANN DOOR OPERATING DEVICE FOR STOVES AND FURNACES Filed May23, 1928 INVENTOR. Cha "1% L. Grohmqnn A TTORNE Y.

Patented Apr. 8, 1 9 30 @FFWF DOOR-OPERATING DEVICE FOR STOVES ANDFURNACES Application filed May 23, 1928.

This invention relates to means for controlling the opening'and closingof doors, such, for example, as stove doors and more particularly toheating stoves, suchas are en- 6 closed within a casing where operationof the fuel doors is made difficult on account of the heated conditionthey are in, due to the fire within the stove.

The present invention has for its objects to provide simple, etficientand reliable means for opening and closing doors, which are pivotallymountedupon heating stoves, by operated foot pedals.

Another object ofmy invention is to :provide doors having means forcovering the space between the lower door and the fire chamber so thatno ashes can fall through onto the floor.

Still another-object of my invention is to providemeans to compensatefor the expansion and contraction of that portion of the doorswhich isin close contact with the heat.

Various other objects and advantages will become apparent as thedescription proceeds.

Myinvention consists in the parts and in the construction, combination,location and arrangement of parts as herein set forth and claimed.

In the drawings: I

Fig. 1 isa front elevation, partly in section, of a heating stoveembodying the invention;

Fig. 2 is aperspective View thereof, the stove appearing in brokenlines,

Fig. 3is an enlarged'fragmentary vertical section of the smoke screenorbaiile plate and one of the upper door hinges taken on a planecorresponding to line 3-3 of Fig. 1;

Fig, 4 is an enlarged fragmentary vertical section of one of the lowerdoor hinges taken on line 44 of Fig.1;

Fig. 5 is an enlarged fragmentary ver' tical section taken on a planecorresponding to line 5-5 of Fig. 1 with a portion of the lower doorshown in open position;

Fig. 6 is an enlarged plan view, partly in section of the foot operatingpedals witha 'fragmentaryportion of the stove base shown inconnectiontherewith;

Serial No. 280,054.

Fig.7 is a vertical section takeiron a plane corresponding toline 77ofFig. 6.

Fig. 8 is a verticalsection onthe line'8- 8 of Fig. l showingthe doorsin closedpositlon;

Fig. 9 is a similar view showing the doors in open position;

Fig. 10 is a detail view of the smoke screen; and

Fig. 11 is a detail view of the slidingeplatc 8 looking at the bottomsidethereof; and

Fig. 12 is a fragmentary side elevation showin the doors in closedposition and the means for connecting same.

In the embodiment of my invention as illus trated and which shows apreferred construction i provide a heating stove comprising base 1,ash-pit 2, and fire chamber 3. The fire chamber 3 consists of uppersection t and lower section 1 upper section a is provided with opening5. The invention lies in theconstruction of the upper door 6 and lowerdoor 7, the mannor in which they are opened and closed, the

sliding plate 8, which covers the space between the lower door 7 and thelower edge 9 of opening 5, as clearly shown in Figs-.5 and 9, and in theother features as claimed. The

upper door 6 is provided with lug extensions 10 at its top which areprovided with holeslf) adapted'to receivepivot shaft 11. Removable lugs12, securely fixed to shelf 13-ofupper section 4 by bolts 1-; andnuts 15(Fig. 3),

are also provided with holes 12 for the 'purpose of receiving the endsof shaft 11.

As clearly shown 1n Fig, 1, the upper door 6 is provided with upwardlyextended arm 16 and forwardly extended arm 17 and lower door 7 isprovided with rearwardly extending arm 18. Arm 18 is pivotally connectedto the upper end of rod 19 as by machinebolt 20,

These partsmay'be of the 7 usual and well-known construction and the Thelower door 7 is provided with recesses or pockets 26, which receive theends of lugs 24 when said door is in the opened position, as shown inFig. 5. Sliding plate 8 is made in two parts, namely: 8 and 8 as clearlyshown in Fig. 11. The under part 8 of sliding plate 8 is provided withintegral extended journals 27 (Fig. 11) which are adapted to berotatably held within uppersection 4 by lugs 28 cast integral with saidsection 4, as clearly shown in Figs. 5, 8 and 9, respectively. Socket29, formed within under part 8" of plate 8 is adapted to receivedownwardly extending projections 30, formed integral with lower door 7when said lower door is in closed position against upper section 4, asshown in Fig. 8. Thus the sliding plate is prevented from droppingrearwardly into the fire chamber when the doors 6 and 7 are in theclosed position (Fig. 8) but when the doors are in open position, asshown in Fig. 9, the projection 30 is disengaged from within socket 29,whereupon, if desired, the sliding plate 8 may be removed.

The sliding plate 8 is preferably made 1n two parts, 8 and 8 with aloose fit between said parts to compensate for expansion and contractionof the metal, thus avoiding excessive warping of the sliding plate whichmight result if the sliding plate were made in one piece only. With thisconstruction if the part 8 warps, due to excessive heat, it can bereplaced by a new part 8 instead of replacing the entire sliding plate8, thereby resulting in considerable economy.

The lower end of rod 19 is passed through hole 31 in base 1 (see Figs.1, 2 and 6) and foot pedal 32 is attached thereto beneath said base 1 bysuitable fastening means as, for example, bolt and nut 33. Said footpedal 32 is provided with horizontally disposed arm 34, which armengages the inner end of foot pedal 35 for the reason clearly pointedout hereinafter under operation.

Foot pedal 35 is pivotally mounted upon bolt 36, carried by lugs 37,said lugs being preferably cast integral with the underside 1 of base 1.

As shown in'Fig. 10, I provide a grille smoke curtain 38 having bearinglugs 39 cast integral therewith and provided with holes 40. Lugs 41,formed on the inner surface of shelf 13, are provided with holes 42(Figs. 3 and 8).

To pivotally attach the grille smoke curtain 38 beneath shelf 13, simplyalign holes 40 of lugs 39 with holes '42 of lugs 41 and insert a pivotshaft 43, as shown in Figs. 3, 8 or 9, respectively. Normally the grillesmoke curtain 38 will hang in the position shown by full lines in Fig. 3(thus closing off the upper portion of the opening 5) but when it isdesiredto add fuel, such as large lumps of coal to the fire, saidcurtain 38 may be easily pushed or swung rearwardly upon shaft 43 (bycontact of the fuel) to the position indicated by dotted lines in Fig.3, or full lines, as shown in Fig. 9. This grille smoke curtain servesto prevent smoke from passing out into the room through opening 5 whenthe doors 6 and 7, respectively, are opened.

It will also be noticed that the grille smoke curtain 38 is providedwith a plurality of slots 38. Theseslots permit a better view of thefire to the person firing the stove when the doors 6 and 7 are opened.The fingers or ribs 38 of the grille smoke curtain 38 are preferablyT-shaped in cross section for strength and also to prevent warping dueto their exposure to the heat within the fire chamber. The constructionof the bafiie or curtain 38 with spaced apart fingers permits ofcontraction and expansion and avoids warping of the battle.

Operation.-lVhen doors 6 and 7 are closed against upper section 4, thusclosing the opening 5, the foot pedals 32 and 35, respectively, will bein the position shown by full lines in Figs. 1 and 2.

To open the doors 6 and 7, simply press downwardly on foot pedal 32. Asfoot pedal 32 is rigidly attached to rod 19, said rod will also be moveddownwardly which, in turn, draws downwardly on arm 16 of door 6 and asthe pivotal connection between the upper end of said rod 19 and arm 16is oil center with the pivot shaft 11, said door 6 will be drawnupwardly to the position shown in Fig. 9. Link 21, pivotally connectedto doors 6 and 7, in turn, opens lower door 7 simultaneously with upperdoor 6. As the lower door 7 is opened the sliding plate 8 covers thespace or gap 44 left between said door and the lower edge 9 of opening 5(Figs. 5 and 9). On the downward movement of foot pedal 32, arm 34thereof is brought into contact with the inner end 35 of foot pedal 35and moves said pedal 35 from the angular position shown by full lines inFig. 1 to the dotted position (same figure) thus setting said foot pedal35, ready to be operated.

Due to the weight of sliding plate 8 the doors 6 and 7 remain open afterthe operation of foot pedal 32 until foot pedal 35 is pushed downwardly,thereby closing the doors 6 and 7 as follows:

When the foot pedal 35 is pushed downwardly from the position shown bydotted lines in Fig. 1 to the position shown by full lines (same figure,or Fig. 2) the inner end 35 of foot pedal 32 will thereby raise said arm34, foot pedal 32, rod 19 and arm 16, respectively, which, in turn,closes door 7 simultaneously with door 6 through arms 17 and 18 and link21, respectively.

It will readily be seen from the foreging description, taken inconnection with the accompanying drawings, that the opening and closingof doors 6 and 7 is easily accomplished by simply pressing downward, bythe foot, on pedal 32 or 35 as the case may be.

To open the doors 6 and 7, simply press downward on foot pedal 32. Toclose said doors simply press downward on foot pedal 35.

An advantage of this invention over prior constructions is that handlingof the hot doors 6 and 7 by the hands is eliminated. This preventsburning of the hands, which is often the case with hand-operated stovedoors.

Another advantage of this invention is that the doors 6 and 7 may beopened or closed with one foot, thus leaving both hands of the operatorfree to manipulate the shovel when adding fuel to the fire.

Still another advantage of this invention is the manner in which thesliding plate 8 covers the gap at between the lower door 7 and the lowerfire chamber 3 when said door is in open position, thereby preventingany ashes, soot or coal from falling through onto the floor when addingfuel to the fire or when opening or closing the doors.

While I have shown one en'ibodiment of my invention, it will beunderstood that certain changes and modifications can be made withoutdeparting from the scope or spirit thereof, as defined in the claims.

l/Vhat I claim as new and desire to secure by Letters Patent is:

1. In combination, a pair of stove doors comprising an upper and lowerdoor, a link pivotally connecting said doors with each other, a rodpivotally connected to the upper of said doors, a foot pedal attached tothe lower end of said rod for opening said doors, a weighted plateslidably mounted relative to the lower of said doors and adapted toexert inward pressure upon said lower door when the latter is in closedposition and for exerting downward pressure on said lower door, which inturn exerts upward pressure upon the upper door through said link whensaid doors are in the closed position, and a foot pedal combined withsaid first-mentioned foot pedal for closing said doors.

2. The combination, as specified in claim 1, wherein the weighted plateserves a double purpose, in so far asit holds the doors open and closedand also serves to close the gap between the lower of said doors and theframe upon which they are p1votally mounted.

3. In combination, a pair of stove doors comprising an upper and lowerdoor, a foot control device for opening and closing said doors,comprising, a link, one end of which is pivotally attached to the upperof said doors and the other end of which is pivotally attached to thelower of said doors whereby said doors are required to open and close inunison, an arm integrally formed with the upper door, a rod pivotallyconnected to said arm, a foot-pedal attached to the lower-end of saidrod andhaving-a horizontally disposed lug, a second foot pedal adaptedtobe set in operative position by said lug, anda welghted plate earnedby sa d lower door whereby when said first-mentioned foot pedal isdepressed said. doors willbe opened in unison and held open by saidweightedplate and whereby when said second-mentioned foot pedalisdepressed, said doors will be closed in unison and held closed by saidplate.

of said doors, a rod pivotally attached to said" arm and slidablyreceived and guided bythe stove base near its lower end, a foot pedalattached to the lower end of said rod, a link pivotally connected toeach of said doors, and a weighted sliding plate supported by the lowerof said doors adapted to hold said doors in open or closed position,depending upon the position of said foot pedal.

5. The combination, as specified in claim 4, wherein the weightedsliding plate includes means for preventing its fallingwithin the stovewhen the doors are in closediposition comprising a socket in said plate,a projection formed on the inner side of said lower door and adapted tobe received by said socket when said door is in closed position, saidplate also serving to cover the gap or space between the lower door andthe stove frame.

6. In combination, a pair of stove doors comprising an upper and lowerdoor, a frame provided with an opening therein, said doors pivoted tosaid frame and adapted to close said opening, a link pivotallyconnecting said doors with each other, a pair of foot pedals, meansconnecting said foot pedals with the upper of said doors, whereby whendepressing one of said pedals, said doors are adapted to be opened inunison and whereby when the other of said pedals is depressed said doorsare adapted to be closed in unison and a weighted plate associated withsaid lower door whereby said doors are held open or closed dependingupon the position of said foot pedals.

7. In combination, a pair of stove doors comprising an upper and lowerdoor, a frame provided with an opening therein, said doors pivotallymounted upon said frame and adapted to close said opening, meanspivotally connected to said doors whereby they are required to move inunison, means operable by foot pressure and connected to one of saiddoors whereby both of said doors may be opened or closed when desired,and slidable means within the lower door adapted to hold said door inopen and closed positions, respectively.

8. A door operating device for stoves and furnaces comprising, incombination, a door casing, a pair of doors mounted to close againstsaid casing and comprising an upper and lower door, means associatedwith the lower door whereby the joint between said 5 door and casing iscovered, weighted means for holding said doors open, and foot pressuremeans for closing saidldoors, means op erable by foot pressure to opensaid doors in unison when desired.

' 9. In a stove or furnace having an opening for the reception of fueland having a pair of doors adapted to close said opening, a pivotallymounted slotted baflie adapted to project downwardly and outwardly topartly close said opening and adapted to swing inwardly under pressureof the fuel bein inserted into the stove, substantially as set Forth andfor the purposes specified.

10. A pivotally mounted bafile, as specified in claim 9, having a seriesof spaced apart fingers formed substantially T-shaped in cross-section,for clear-er visibility.

11. In means of the character described, a sliding plate comprising twoparts loosely connected together whereby one-plate may movelongitudinally and laterally relative to the other plate to compensatefor contraction and expansion of the metal.

CHARLES L. GOHMANN.

